Windows 8 doesn't allow users to change the sound settings pertaining to system events such as Windows startup, shutdown, logon and logoff through Control Panel. However, a registry tweak can help you customize the sound settings easily.
Facebook offers you a special domain email ID as username @facebook.com. However, with a bid to popularize the Facebook ID, it has taken a stringent action, which may not be acceptable to all. What's that? In the profile page you may notice the replacement of your original email ID with the newly introduced one. If the change doesn't interest you then go ahead.